diff --git a/euclid.cpp b/euclid.cpp
index c0551e25..c10ce3db 100644
--- a/euclid.cpp
+++ b/euclid.cpp
@@ -534,7 +534,7 @@ namespace euclid3 {
     return true;
     }
 
-  bool dist_alt(cell *c) {
+  int dist_alt(cell *c) {
     coord co = cubemap()->ispacemap[c->master];
     return getcoord(co, 2);
     }